Stuff like that is pretty common in suburban Northern Virginia (for example). There are lots of busy roads with two lanes in each direction which expand to three, four, five, or even six lanes at intersections with dedicated turn lanes. I think the only reason that "proposed hack" screenshot looks so weird is because the distance between intersections is much, much shorter than it would be in real life, relative to the width of the road. For example, you can see it in action in various amounts for all four directions of this intersection:
https://www.google.com/maps/@38.9770719,-77.3149885,438m/dat...
But it doesn't look comical, because the roads are proportionately much more slender and the transitions more gradual.
I haven't played the game, but it sounds like it ended up being accurate here!